EC103B1AP Equivalent & Substitute Parts

Part Overview

The EC103B1AP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200 V off-state voltage and 800 mA on-state current in a TO-92 through-hole package, manufactured by Littelfuse Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -40°C to 110°C and is ROHS3 compliant.

Key Parameters

Parameter	Value
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	12 µA
Voltage - On State (Vtm) (Max)	1.7 V
Current - On State (It (RMS)) (Max)	800 mA
Current - Hold (Ih) (Max)	5 mA
SCR Type	Sensitive Gate
Operating Temperature	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the EC103B1AP is determined by the following critical parameters: SCR Type (Sensitive Gate), Mounting Type (Through Hole), Package compatibility (TO-92-3), Gate Trigger characteristics (Vgt and Igt), On-State current rating (800 mA RMS), and Hold current (5 mA maximum).

The substitute parts are grouped into two categories:

Upgrade Substitutes (Littelfuse EC103 Series): EC103D1AP and EC103M1AP maintain identical gate trigger specifications, on-state current ratings, hold current, and operating temperature range. These parts differ only in off-state voltage rating (400 V and 600 V respectively), providing higher voltage capability while preserving all other electrical characteristics and package form factor.

Manufacturer-Recommended Substitute (STMicroelectronics P0118DA 5AL3): This part shares the same 400 V off-state voltage as EC103D1AP, identical on-state current rating (800 mA RMS), and compatible TO-92-3 package. Minor variations exist in gate trigger current (5 µA vs. 12 µA maximum) and on-state voltage drop (1.95 V vs. 1.7 V maximum), with an extended operating temperature range to 125°C.

Parameter Comparison

Parameter	EC103B1AP	EC103D1AP	EC103M1AP	P0118DA 5AL3
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics
Voltage - Off State	200 V	400 V	600 V	400 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	12 µA	12 µA	12 µA	5 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	1.7 V	1.95 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA	800 mA
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA	5 mA
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using EC103B1AP, the Littelfuse EC103D1AP and EC103M1AP are the primary substitutes. Both parts are active products with current manufacturing support, ROHS3 compliance, and identical electrical characteristics to the original part except for increased off-state voltage ratings. EC103D1AP provides 400 V capability, while EC103M1AP extends this to 600 V, allowing for higher system voltage designs without component substitution.

The STMicroelectronics P0118DA 5AL3 is a manufacturer-recommended alternative with 400 V off-state voltage and ROHS3 compliance. This part exhibits slightly higher on-state voltage drop (1.95 V maximum versus 1.7 V) and lower gate trigger current (5 µA maximum versus 12 µA), with an extended operating temperature range to 125°C. However, this part is classified as obsolete, limiting its suitability for new long-term procurement strategies.

For new designs or ongoing production requiring active product status and assured supply, EC103D1AP or EC103M1AP are the recommended selections based on voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can EC103D1AP or EC103M1AP be used as direct replacements for EC103B1AP?

A: Yes. Both parts maintain identical gate trigger voltage and current specifications, on-state current rating (800 mA RMS), hold current (5 mA), and operating temperature range (-40°C to 110°C). The primary difference is increased off-state voltage rating, which provides design margin in higher voltage applications. Physical package form factor (TO-92-3) and through-hole mounting are identical.

Q: What is the difference between EC103D1AP and EC103M1AP?

A: Both parts are functionally identical Littelfuse Sensitive Gate SCRs with the same gate trigger and on-state current characteristics. EC103D1AP is rated for 400 V off-state voltage, while EC103M1AP is rated for 600 V. Selection depends on the maximum voltage the SCR must withstand in the application circuit.

Q: Why is P0118DA 5AL3 listed as a substitute if it is obsolete?

A: P0118DA 5AL3 is included as a manufacturer-recommended alternative based on the original part specifications. However, its obsolete status makes it unsuitable for new procurement. The active Littelfuse alternatives (EC103D1AP and EC103M1AP) are preferred for ongoing designs.

Q: Are there differences in gate trigger characteristics between these parts?

A: EC103B1AP, EC103D1AP, and EC103M1AP all specify 800 mV maximum gate trigger voltage and 12 µA maximum gate trigger current. P0118DA 5AL3 specifies 5 µA maximum gate trigger current, requiring less gate drive current for triggering. This difference may affect gate drive circuit design.

Q: Can these parts be used interchangeably in existing PCB layouts?

A: Yes. All substitute parts use the TO-92-3 package with identical lead configuration and spacing. No PCB layout modifications are required for physical substitution.

Q: What compliance certifications apply to these parts?

A: All listed parts are ROHS3 compliant. EC103D1AP and EC103M1AP include REACH Unaffected status. All parts carry EAR99 ECCN classification and HTSUS code 8541.30.0080.

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